Hi,
no,i kept the Piper 285 ultimate road cam. The issue was,i have pretty long gearbox (70-126-180-266-3xx*8000),so with the piper,the dynamic compression was way too low. Engine static cr is somewhere around 9:1.
The GT1 cam closes intake ~40ABDC,the piper ~70 ABDC. This means,at low revs,the dynamic CR is way too low. I had issues to keep speed in level sufrace in 4th and 5th if the rpm was below 3000.
I advanced the cam,so i got back some of the dynamic CR. This helped a lot in fuel economy. Also the turbo spool was ok with launch control. Piper right on the mark was awful,i could not build sufficient boost to have a good launch.
So my advice is to advance the cam,until it revs ok and bottom end rpm has enough torque. You can also validate it with simple compression measurement,you can compare results with cam on mark and with advanced cam. If i remember well,i have half a tooth advance,maybe a bit more.
Engine revs up to 8000 where it hits the limiter,i assume it could do more,but after ~7200-7500 it starts to loose some power. I think at that high revs,cam on mark would be the answer. I always wanted to design a VVT on the SOHC,but never realised it :grin: